Synthesis and Characterization of Silver Hollandite and Its Application in Emission Control.

Li-yu, LI; King, David L.

doi:10.1002/chin.200545016

Cited by 11 publications

(12 citation statements)

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“…After treated in KOH solution, the charge on the tunnel cation (K + ) is balanced by substitution of Mn 3+ for some of the Mn 4+ in the framework. 31 Further observation (Figure 4d) has shown that the binding energy difference (ΔE s ) between the two peaks of Mn 3s varies with the increase of K + content and the AOS of surface Mn has been estimated via the following formula: 37,38 AOS = 8.956−1.126ΔE s . After treated in KOH solution, the AOS of Mn gradually decreases from 3.76 to 3.37 with the extension of treatment time, meaning a lower average coordination number and higher oxygen vacancy content.…”

Section: Environmental Science and Technologymentioning

confidence: 98%

“…Generally, these cations are located in the center of tunnels and the charge on the cations would be balanced by substitution of Mn 3+ for some of the Mn 4+ . 31 So, oxygen vacancies are easy to form at the MnO 6 edges and a higher ozone removal rate is expected when the K + entered into the tunnels. Herein, we developed a simply postprocessing method to prepare K-rich α-MnO 2 nanowire for ozone catalytic decomposition.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the K⁺ Concentration in the Tunnels of α-MnO₂ To Increase the Content of Oxygen Vacancy for Ozone Elimination

Zhu

et al. 2018

Environ. Sci. Technol.

162

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α-MnO is a promising material for ozone catalytic decomposition and the oxygen vacancy is often regarded as the active site for ozone adsorption and decomposition. Here, α-MnO nanowire with tunable K concentration was prepared through a hydrothermal process in KOH solution. High concentration K in the tunnel can expand crystal cell and break the charge balance, leading to a lower average oxidation state (AOS) of Mn, which means abundant oxygen vacancy. DFT calculation has also proven that the samples with higher K concentration exhibit lower formation energy for oxygen vacancy. Due to the enormous active oxygen vacancies existing in the α-MnO nanowire, the lifetime of the catalyst (corresponding to 100% ozone removal rate, 25 °C) is increased from 3 to 15 h. The FT-IR results confirmed that the accumulation of intermediate oxygen species on the catalyst surface is the main reason why it is deactivated after long time reaction. In this work, the performance of the catalyst has been improved because the abundant active oxygen vacancies are fabricated by the electrostatic interaction between oxygen atoms inside the tunnels and the introduced K, which offers us a new perspective to design a high efficiency catalyst and may promote manganese oxide for practical ozone elimination.

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Section: Environmental Science and Technologymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Tuning the K⁺ Concentration in the Tunnels of α-MnO₂ To Increase the Content of Oxygen Vacancy for Ozone Elimination

Zhu

et al. 2018

Environ. Sci. Technol.

162

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“…In recent years, metal nanoparticles have been studied extensively due to their noticeable electrical, optical, and catalytic properties [1][2][3][4]. As one of the traditional noble metals, Ag nanoparticles have been synthesized for various applications, such as biomedical antibacterial materials [5,6], catalysis [1,7,8], tribology [9], and surface-enhanced Raman scattering (SERS) [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Synthesis and Catalytic Properties of Surfactant-Modified Ag Nanoparticles

Sun

Hou

et al. 2012

International Journal of Spectroscopy

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Well-dispersed Ag nanoparticles with size of 20–30 nm were synthesized in water at room temperature with a self-made novel imidazoline Gemini surfactant quaternary ammonium salt of di (2-heptadecyl-1-formyl aminoethyl imidazoline) hexanediamine. Transmission electron microscopy, X-ray powder diffraction, ultraviolet-visible absorption spectra, and Fourier transform infrared ray were used to characterize the Ag nanoparticles. Results showed that the micellized aggregation of imidazoline Gemini surfactant in water, the growth of Ag initial particles, and the interaction (adsorption and coordination) between surfactant and Ag+/Ag nanoparticles took place simultaneously to form the well-dispersed Ag nanoparticles. Catalytic results show that the surface-modified Ag product was an active metal catalyst for methyl orange reduction reaction due to the effective adsorption between Ag nanoparticles and methyl orange molecules, which was of promising application in environmental protection.

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“…Porous manganese oxides such as α-MnO 2 hollandites (termed OMS-2, octahedral molecular sieves-2) have gained significant attention as electroactive materials 1 as their tunnel-based crystallographic structure may provide sufficient structural rigidity to enable repeated ion exchange within their one-dimensional (1D) forms 2 3 4 5 6 7 8 9 . Specifically, 1+ or 2+ cations often partially occupy the tunnels resulting in mixed Mn 3+/4+ oxidation states in the MnO 6 octahedra 10 11 .…”

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confidence: 99%

Visualization of lithium-ion transport and phase evolution within and between manganese oxide nanorods

Meng

et al. 2017

Nat Commun

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Multiple lithium-ion transport pathways and local phase changes upon lithiation in silver hollandite are revealed via in situ microscopy including electron diffraction, imaging and spectroscopy, coupled with density functional theory and phase field calculations. We report unexpected inter-nanorod lithium-ion transport, where the reaction fronts and kinetics are maintained within the neighbouring nanorod. Notably, this is the first time-resolved visualization of lithium-ion transport within and between individual nanorods, where the impact of oxygen deficiencies is delineated. Initially, fast lithium-ion transport is observed along the long axis with small net volume change, resulting in two lithiated silver hollandite phases distinguishable by orthorhombic distortion. Subsequently, a slower reaction front is observed, with formation of polyphase lithiated silver hollandite and face-centred-cubic silver metal with substantial volume expansion. These results indicate lithium-ion transport is not confined within a single nanorod and may provide a paradigm shift for one-dimensional tunnelled materials, particularly towards achieving high-rate capability.

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Synthesis and Characterization of Silver Hollandite and Its Application in Emission Control.

Abstract: For Abstract see ChemInform Abstract in Full Text.

Cited by 11 publications

References 1 publication

Tuning the K⁺ Concentration in the Tunnels of α-MnO₂ To Increase the Content of Oxygen Vacancy for Ozone Elimination

Tuning the K⁺ Concentration in the Tunnels of α-MnO₂ To Increase the Content of Oxygen Vacancy for Ozone Elimination

Room Temperature Synthesis and Catalytic Properties of Surfactant-Modified Ag Nanoparticles

Visualization of lithium-ion transport and phase evolution within and between manganese oxide nanorods

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Synthesis and Characterization of Silver Hollandite and Its Application in Emission Control.

Abstract: For Abstract see ChemInform Abstract in Full Text.

Cited by 11 publications

References 1 publication

Tuning the K+ Concentration in the Tunnels of α-MnO2 To Increase the Content of Oxygen Vacancy for Ozone Elimination

Tuning the K+ Concentration in the Tunnels of α-MnO2 To Increase the Content of Oxygen Vacancy for Ozone Elimination

Room Temperature Synthesis and Catalytic Properties of Surfactant-Modified Ag Nanoparticles

Visualization of lithium-ion transport and phase evolution within and between manganese oxide nanorods

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Product

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Tuning the K⁺ Concentration in the Tunnels of α-MnO₂ To Increase the Content of Oxygen Vacancy for Ozone Elimination

Tuning the K⁺ Concentration in the Tunnels of α-MnO₂ To Increase the Content of Oxygen Vacancy for Ozone Elimination